8b57c49490
Reworked the EVM gas instructions to use 64bit integers rather than arbitrary size big ints. All gas operations, be it additions, multiplications or divisions, are checked and guarded against 64 bit integer overflows. In additon, most of the protocol paramaters in the params package have been converted to uint64 and are now constants rather than variables. * common/math: added overflow check ops * core: vmenv, env renamed to evm * eth, internal/ethapi, les: unmetered eth_call and cancel methods * core/vm: implemented big.Int pool for evm instructions * core/vm: unexported intPool methods & verification methods * core/vm: added memoryGasCost overflow check and test
199 lines
5.8 KiB
Go
199 lines
5.8 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package miner implements Ethereum block creation and mining.
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package miner
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import (
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"fmt"
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"math/big"
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"sync/atomic"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/pow"
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)
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// Backend wraps all methods required for mining.
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type Backend interface {
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AccountManager() *accounts.Manager
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BlockChain() *core.BlockChain
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TxPool() *core.TxPool
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ChainDb() ethdb.Database
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}
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// Miner creates blocks and searches for proof-of-work values.
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type Miner struct {
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mux *event.TypeMux
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worker *worker
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threads int
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coinbase common.Address
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mining int32
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eth Backend
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pow pow.PoW
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canStart int32 // can start indicates whether we can start the mining operation
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shouldStart int32 // should start indicates whether we should start after sync
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}
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func New(eth Backend, config *params.ChainConfig, mux *event.TypeMux, pow pow.PoW) *Miner {
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miner := &Miner{
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eth: eth,
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mux: mux,
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pow: pow,
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worker: newWorker(config, common.Address{}, eth, mux),
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canStart: 1,
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}
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go miner.update()
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return miner
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}
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// update keeps track of the downloader events. Please be aware that this is a one shot type of update loop.
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// It's entered once and as soon as `Done` or `Failed` has been broadcasted the events are unregistered and
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// the loop is exited. This to prevent a major security vuln where external parties can DOS you with blocks
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// and halt your mining operation for as long as the DOS continues.
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func (self *Miner) update() {
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events := self.mux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{})
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out:
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for ev := range events.Chan() {
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switch ev.Data.(type) {
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case downloader.StartEvent:
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atomic.StoreInt32(&self.canStart, 0)
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if self.Mining() {
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self.Stop()
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atomic.StoreInt32(&self.shouldStart, 1)
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glog.V(logger.Info).Infoln("Mining operation aborted due to sync operation")
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}
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case downloader.DoneEvent, downloader.FailedEvent:
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shouldStart := atomic.LoadInt32(&self.shouldStart) == 1
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atomic.StoreInt32(&self.canStart, 1)
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atomic.StoreInt32(&self.shouldStart, 0)
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if shouldStart {
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self.Start(self.coinbase, self.threads)
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}
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// unsubscribe. we're only interested in this event once
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events.Unsubscribe()
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// stop immediately and ignore all further pending events
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break out
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}
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}
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}
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func (m *Miner) GasPrice() *big.Int {
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return new(big.Int).Set(m.worker.gasPrice)
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}
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func (m *Miner) SetGasPrice(price *big.Int) {
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// FIXME block tests set a nil gas price. Quick dirty fix
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if price == nil {
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return
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}
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m.worker.setGasPrice(price)
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}
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func (self *Miner) Start(coinbase common.Address, threads int) {
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atomic.StoreInt32(&self.shouldStart, 1)
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self.worker.setEtherbase(coinbase)
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self.coinbase = coinbase
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self.threads = threads
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if atomic.LoadInt32(&self.canStart) == 0 {
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glog.V(logger.Info).Infoln("Can not start mining operation due to network sync (starts when finished)")
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return
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}
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atomic.StoreInt32(&self.mining, 1)
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for i := 0; i < threads; i++ {
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self.worker.register(NewCpuAgent(i, self.pow))
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}
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glog.V(logger.Info).Infof("Starting mining operation (CPU=%d TOT=%d)\n", threads, len(self.worker.agents))
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self.worker.start()
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self.worker.commitNewWork()
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}
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func (self *Miner) Stop() {
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self.worker.stop()
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atomic.StoreInt32(&self.mining, 0)
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atomic.StoreInt32(&self.shouldStart, 0)
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}
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func (self *Miner) Register(agent Agent) {
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if self.Mining() {
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agent.Start()
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}
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self.worker.register(agent)
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}
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func (self *Miner) Unregister(agent Agent) {
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self.worker.unregister(agent)
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}
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func (self *Miner) Mining() bool {
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return atomic.LoadInt32(&self.mining) > 0
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}
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func (self *Miner) HashRate() (tot int64) {
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tot += self.pow.GetHashrate()
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// do we care this might race? is it worth we're rewriting some
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// aspects of the worker/locking up agents so we can get an accurate
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// hashrate?
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for agent := range self.worker.agents {
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tot += agent.GetHashRate()
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}
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return
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}
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func (self *Miner) SetExtra(extra []byte) error {
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if uint64(len(extra)) > params.MaximumExtraDataSize {
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return fmt.Errorf("Extra exceeds max length. %d > %v", len(extra), params.MaximumExtraDataSize)
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}
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self.worker.setExtra(extra)
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return nil
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}
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// Pending returns the currently pending block and associated state.
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func (self *Miner) Pending() (*types.Block, *state.StateDB) {
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return self.worker.pending()
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}
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// PendingBlock returns the currently pending block.
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//
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// Note, to access both the pending block and the pending state
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// simultaneously, please use Pending(), as the pending state can
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// change between multiple method calls
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func (self *Miner) PendingBlock() *types.Block {
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return self.worker.pendingBlock()
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}
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func (self *Miner) SetEtherbase(addr common.Address) {
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self.coinbase = addr
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self.worker.setEtherbase(addr)
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}
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